2 * arch/arm/mach-ep93xx/core.c
3 * Core routines for Cirrus EP93xx chips.
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
7 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
8 * role in the ep93xx linux community.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
19 #include <linux/sched.h>
20 #include <linux/interrupt.h>
21 #include <linux/serial.h>
22 #include <linux/tty.h>
23 #include <linux/bitops.h>
24 #include <linux/serial.h>
25 #include <linux/serial_8250.h>
26 #include <linux/serial_core.h>
27 #include <linux/device.h>
29 #include <linux/time.h>
30 #include <linux/timex.h>
31 #include <linux/delay.h>
32 #include <linux/termios.h>
33 #include <linux/amba/bus.h>
34 #include <linux/amba/serial.h>
36 #include <asm/types.h>
37 #include <asm/setup.h>
38 #include <asm/memory.h>
39 #include <asm/hardware.h>
41 #include <asm/system.h>
42 #include <asm/tlbflush.h>
43 #include <asm/pgtable.h>
46 #include <asm/mach/map.h>
47 #include <asm/mach/time.h>
48 #include <asm/mach/irq.h>
49 #include <asm/arch/gpio.h>
51 #include <asm/hardware/vic.h>
54 /*************************************************************************
55 * Static I/O mappings that are needed for all EP93xx platforms
56 *************************************************************************/
57 static struct map_desc ep93xx_io_desc[] __initdata = {
59 .virtual = EP93XX_AHB_VIRT_BASE,
60 .pfn = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
61 .length = EP93XX_AHB_SIZE,
64 .virtual = EP93XX_APB_VIRT_BASE,
65 .pfn = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
66 .length = EP93XX_APB_SIZE,
71 void __init ep93xx_map_io(void)
73 iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
77 /*************************************************************************
78 * Timer handling for EP93xx
79 *************************************************************************
80 * The ep93xx has four internal timers. Timers 1, 2 (both 16 bit) and
81 * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate
82 * an interrupt on underflow. Timer 4 (40 bit) counts down at 983.04 kHz,
83 * is free-running, and can't generate interrupts.
85 * The 508 kHz timers are ideal for use for the timer interrupt, as the
86 * most common values of HZ divide 508 kHz nicely. We pick one of the 16
87 * bit timers (timer 1) since we don't need more than 16 bits of reload
88 * value as long as HZ >= 8.
90 * The higher clock rate of timer 4 makes it a better choice than the
91 * other timers for use in gettimeoffset(), while the fact that it can't
92 * generate interrupts means we don't have to worry about not being able
93 * to use this timer for something else. We also use timer 4 for keeping
94 * track of lost jiffies.
96 static unsigned int last_jiffy_time;
98 #define TIMER4_TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
100 static int ep93xx_timer_interrupt(int irq, void *dev_id)
102 write_seqlock(&xtime_lock);
104 __raw_writel(1, EP93XX_TIMER1_CLEAR);
106 (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
107 >= TIMER4_TICKS_PER_JIFFY) {
108 last_jiffy_time += TIMER4_TICKS_PER_JIFFY;
112 write_sequnlock(&xtime_lock);
117 static struct irqaction ep93xx_timer_irq = {
118 .name = "ep93xx timer",
119 .flags = IRQF_DISABLED | IRQF_TIMER,
120 .handler = ep93xx_timer_interrupt,
123 static void __init ep93xx_timer_init(void)
125 /* Enable periodic HZ timer. */
126 __raw_writel(0x48, EP93XX_TIMER1_CONTROL);
127 __raw_writel((508469 / HZ) - 1, EP93XX_TIMER1_LOAD);
128 __raw_writel(0xc8, EP93XX_TIMER1_CONTROL);
130 /* Enable lost jiffy timer. */
131 __raw_writel(0x100, EP93XX_TIMER4_VALUE_HIGH);
133 setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq);
136 static unsigned long ep93xx_gettimeoffset(void)
140 offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;
142 /* Calculate (1000000 / 983040) * offset. */
143 return offset + (53 * offset / 3072);
146 struct sys_timer ep93xx_timer = {
147 .init = ep93xx_timer_init,
148 .offset = ep93xx_gettimeoffset,
152 /*************************************************************************
153 * GPIO handling for EP93xx
154 *************************************************************************/
155 static unsigned char gpio_int_enable[2];
156 static unsigned char gpio_int_type1[2];
157 static unsigned char gpio_int_type2[2];
159 static void update_gpio_ab_int_params(int port)
162 __raw_writeb(0, EP93XX_GPIO_A_INT_ENABLE);
163 __raw_writeb(gpio_int_type2[0], EP93XX_GPIO_A_INT_TYPE2);
164 __raw_writeb(gpio_int_type1[0], EP93XX_GPIO_A_INT_TYPE1);
165 __raw_writeb(gpio_int_enable[0], EP93XX_GPIO_A_INT_ENABLE);
166 } else if (port == 1) {
167 __raw_writeb(0, EP93XX_GPIO_B_INT_ENABLE);
168 __raw_writeb(gpio_int_type2[1], EP93XX_GPIO_B_INT_TYPE2);
169 __raw_writeb(gpio_int_type1[1], EP93XX_GPIO_B_INT_TYPE1);
170 __raw_writeb(gpio_int_enable[1], EP93XX_GPIO_B_INT_ENABLE);
175 static unsigned char data_register_offset[8] = {
176 0x00, 0x04, 0x08, 0x0c, 0x20, 0x30, 0x38, 0x40,
179 static unsigned char data_direction_register_offset[8] = {
180 0x10, 0x14, 0x18, 0x1c, 0x24, 0x34, 0x3c, 0x44,
183 void gpio_line_config(int line, int direction)
185 unsigned int data_direction_register;
189 data_direction_register =
190 EP93XX_GPIO_REG(data_direction_register_offset[line >> 3]);
192 local_irq_save(flags);
193 if (direction == GPIO_OUT) {
194 if (line >= 0 && line < 16) {
195 gpio_int_enable[line >> 3] &= ~(1 << (line & 7));
196 update_gpio_ab_int_params(line >> 3);
199 v = __raw_readb(data_direction_register);
200 v |= 1 << (line & 7);
201 __raw_writeb(v, data_direction_register);
202 } else if (direction == GPIO_IN) {
203 v = __raw_readb(data_direction_register);
204 v &= ~(1 << (line & 7));
205 __raw_writeb(v, data_direction_register);
207 local_irq_restore(flags);
209 EXPORT_SYMBOL(gpio_line_config);
211 int gpio_line_get(int line)
213 unsigned int data_register;
215 data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
217 return !!(__raw_readb(data_register) & (1 << (line & 7)));
219 EXPORT_SYMBOL(gpio_line_get);
221 void gpio_line_set(int line, int value)
223 unsigned int data_register;
227 data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);
229 local_irq_save(flags);
230 if (value == EP93XX_GPIO_HIGH) {
231 v = __raw_readb(data_register);
232 v |= 1 << (line & 7);
233 __raw_writeb(v, data_register);
234 } else if (value == EP93XX_GPIO_LOW) {
235 v = __raw_readb(data_register);
236 v &= ~(1 << (line & 7));
237 __raw_writeb(v, data_register);
239 local_irq_restore(flags);
241 EXPORT_SYMBOL(gpio_line_set);
244 /*************************************************************************
245 * EP93xx IRQ handling
246 *************************************************************************/
247 static void ep93xx_gpio_ab_irq_handler(unsigned int irq,
248 struct irq_desc *desc)
250 unsigned char status;
253 status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
254 for (i = 0; i < 8; i++) {
255 if (status & (1 << i)) {
256 desc = irq_desc + IRQ_EP93XX_GPIO(0) + i;
257 desc_handle_irq(IRQ_EP93XX_GPIO(0) + i, desc);
261 status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
262 for (i = 0; i < 8; i++) {
263 if (status & (1 << i)) {
264 desc = irq_desc + IRQ_EP93XX_GPIO(8) + i;
265 desc_handle_irq(IRQ_EP93XX_GPIO(8) + i, desc);
270 static void ep93xx_gpio_ab_irq_mask_ack(unsigned int irq)
272 int line = irq - IRQ_EP93XX_GPIO(0);
273 int port = line >> 3;
275 gpio_int_enable[port] &= ~(1 << (line & 7));
276 update_gpio_ab_int_params(port);
279 __raw_writel(1 << (line & 7), EP93XX_GPIO_B_INT_ACK);
281 __raw_writel(1 << (line & 7), EP93XX_GPIO_A_INT_ACK);
285 static void ep93xx_gpio_ab_irq_mask(unsigned int irq)
287 int line = irq - IRQ_EP93XX_GPIO(0);
288 int port = line >> 3;
290 gpio_int_enable[port] &= ~(1 << (line & 7));
291 update_gpio_ab_int_params(port);
294 static void ep93xx_gpio_ab_irq_unmask(unsigned int irq)
296 int line = irq - IRQ_EP93XX_GPIO(0);
297 int port = line >> 3;
299 gpio_int_enable[port] |= 1 << (line & 7);
300 update_gpio_ab_int_params(port);
305 * gpio_int_type1 controls whether the interrupt is level (0) or
306 * edge (1) triggered, while gpio_int_type2 controls whether it
307 * triggers on low/falling (0) or high/rising (1).
309 static int ep93xx_gpio_ab_irq_type(unsigned int irq, unsigned int type)
314 line = irq - IRQ_EP93XX_GPIO(0);
315 gpio_line_config(line, GPIO_IN);
320 if (type & IRQT_RISING) {
321 gpio_int_type1[port] |= 1 << line;
322 gpio_int_type2[port] |= 1 << line;
323 } else if (type & IRQT_FALLING) {
324 gpio_int_type1[port] |= 1 << line;
325 gpio_int_type2[port] &= ~(1 << line);
326 } else if (type & IRQT_HIGH) {
327 gpio_int_type1[port] &= ~(1 << line);
328 gpio_int_type2[port] |= 1 << line;
329 } else if (type & IRQT_LOW) {
330 gpio_int_type1[port] &= ~(1 << line);
331 gpio_int_type2[port] &= ~(1 << line);
333 update_gpio_ab_int_params(port);
338 static struct irq_chip ep93xx_gpio_ab_irq_chip = {
339 .ack = ep93xx_gpio_ab_irq_mask_ack,
340 .mask = ep93xx_gpio_ab_irq_mask,
341 .unmask = ep93xx_gpio_ab_irq_unmask,
342 .set_type = ep93xx_gpio_ab_irq_type,
346 void __init ep93xx_init_irq(void)
350 vic_init((void *)EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK);
351 vic_init((void *)EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK);
353 for (irq = IRQ_EP93XX_GPIO(0) ; irq <= IRQ_EP93XX_GPIO(15); irq++) {
354 set_irq_chip(irq, &ep93xx_gpio_ab_irq_chip);
355 set_irq_handler(irq, handle_level_irq);
356 set_irq_flags(irq, IRQF_VALID);
358 set_irq_chained_handler(IRQ_EP93XX_GPIO_AB, ep93xx_gpio_ab_irq_handler);
362 /*************************************************************************
363 * EP93xx peripheral handling
364 *************************************************************************/
365 #define EP93XX_UART_MCR_OFFSET (0x0100)
367 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
368 void __iomem *base, unsigned int mctrl)
373 if (!(mctrl & TIOCM_RTS))
375 if (!(mctrl & TIOCM_DTR))
378 __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
381 static struct amba_pl010_data ep93xx_uart_data = {
382 .set_mctrl = ep93xx_uart_set_mctrl,
385 static struct amba_device uart1_device = {
387 .bus_id = "apb:uart1",
388 .platform_data = &ep93xx_uart_data,
391 .start = EP93XX_UART1_PHYS_BASE,
392 .end = EP93XX_UART1_PHYS_BASE + 0x0fff,
393 .flags = IORESOURCE_MEM,
395 .irq = { IRQ_EP93XX_UART1, NO_IRQ },
396 .periphid = 0x00041010,
399 static struct amba_device uart2_device = {
401 .bus_id = "apb:uart2",
402 .platform_data = &ep93xx_uart_data,
405 .start = EP93XX_UART2_PHYS_BASE,
406 .end = EP93XX_UART2_PHYS_BASE + 0x0fff,
407 .flags = IORESOURCE_MEM,
409 .irq = { IRQ_EP93XX_UART2, NO_IRQ },
410 .periphid = 0x00041010,
413 static struct amba_device uart3_device = {
415 .bus_id = "apb:uart3",
416 .platform_data = &ep93xx_uart_data,
419 .start = EP93XX_UART3_PHYS_BASE,
420 .end = EP93XX_UART3_PHYS_BASE + 0x0fff,
421 .flags = IORESOURCE_MEM,
423 .irq = { IRQ_EP93XX_UART3, NO_IRQ },
424 .periphid = 0x00041010,
428 static struct platform_device ep93xx_rtc_device = {
429 .name = "ep93xx-rtc",
435 static struct resource ep93xx_ohci_resources[] = {
437 .start = EP93XX_USB_PHYS_BASE,
438 .end = EP93XX_USB_PHYS_BASE + 0x0fff,
439 .flags = IORESOURCE_MEM,
442 .start = IRQ_EP93XX_USB,
443 .end = IRQ_EP93XX_USB,
444 .flags = IORESOURCE_IRQ,
448 static struct platform_device ep93xx_ohci_device = {
449 .name = "ep93xx-ohci",
452 .dma_mask = (void *)0xffffffff,
453 .coherent_dma_mask = 0xffffffff,
455 .num_resources = ARRAY_SIZE(ep93xx_ohci_resources),
456 .resource = ep93xx_ohci_resources,
460 void __init ep93xx_init_devices(void)
467 * Disallow access to MaverickCrunch initially.
469 v = __raw_readl(EP93XX_SYSCON_DEVICE_CONFIG);
470 v &= ~EP93XX_SYSCON_DEVICE_CONFIG_CRUNCH_ENABLE;
471 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
472 __raw_writel(v, EP93XX_SYSCON_DEVICE_CONFIG);
474 amba_device_register(&uart1_device, &iomem_resource);
475 amba_device_register(&uart2_device, &iomem_resource);
476 amba_device_register(&uart3_device, &iomem_resource);
478 platform_device_register(&ep93xx_rtc_device);
479 platform_device_register(&ep93xx_ohci_device);
482 elf_hwcap |= HWCAP_CRUNCH;